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Car Forum / Mercedes-Benz Cars / March 2007OBD1 Pin connections
Hi all, I've put together a little serial code reader for my '89 300E that is running OK but not well... idle is rough.... and I 'will' track the problem down. Which pins on my X11 socket that accesses the ECU will read the most important codes. Appreciate any help. cheers, guenter ps I know pin 3 displays the oxygen sensor for example Check your email for a diagram from the MB WIS software. >Check your email for a diagram from the MB WIS software. Perfect Doug, many thanks! cheers, guenter Can you share some information about this code reader, or the pin assignment? I would like to know what my Check Engine light is trying to tell me. Thanks. > Hi all, > [quoted text clipped - 6 lines] > > ps I know pin 3 displays the oxygen sensor for example >Can you share some information about this code reader, or the pin >assignment? I would like to know what my Check Engine light is trying >to tell me. Thanks. the code reader is rather trivial. simply a momentary push button switch wired in series with an LED (+resistor if it's not internal to the LED). Then the other end of LED goes to batterie's +'ve and the other end of switch to battery's -'ve. The connection between LED and switch has a third connection added (either at LED or switch terminal) that will go to the pins of X12 connector (it has a plastic cap with the sockets for the wires) and is on secondary firwall near battery. Again, I know for certain this is the case for 88 and 89 W124's (103 engine) but not sure of other years. One then simply presses switch for a few seconds to activate ECU that then blinks the LED a number of times to spell out the difficulty it thinks exist. One blink means no problems. Moreover, you can then also erase any stored codes again. I can send you more detailed information/pictures if you need cheers, guenter >> Hi all, >> [quoted text clipped - 6 lines] >> >> ps I know pin 3 displays the oxygen sensor for example |
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